This is essentialy a winning move. White prevents Qd6, which is Black's only plan. It's curious that Sarana played very fast up to this point. Something went really wrong with his opening preparation.
19... e7f8 A natural move to exchange rooks and place the bishop on g7, but this is a clear mistake. 20. c1g5  20... e8e1  21. a1e1  21... f8g7 Adding more problems to Black's position.